From: /dev/rob0 (rob0gmx.co.uk)
Date: Wed Aug 24 2005 - 19:41:40 CDT

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On Wednesday 2005-August-24 00:02, Matthew Lenz wrote:
> When using a FQDN with the relayhost parameter why does that
> relayhost host/domain need to resolve a MX record for it to be able
> to forward mail to said host? why should it even care? If you put

I didn't see anyone answer the "why" part of this. It's a feature. You
can use DNS names you control, and use the MX if you wish. It could
provide a rudimentary form of load balancing, or whatever.

Looking at it from the perspective of a DNS user (that is, not a DNS
administrator), I can see how you might not see the value in doing MX
lookups. But it provides a sort of consistency across Postfix, where
generally all DNS lookups also use MX records first.

And also as consistently documented, the [] brackets inhibit that. I
don't see how that might be confused to mean "optional". The
BASIC_CONFIGURATION_README.html#relayhost language seems quite clear on
that matter.
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